Not that I'll ever believe anything Toyota says, but why would anyone wanna deal with a car company that can't even get it right regarding floor mats?
Police investigators say mechanical failure can't be ruled out in the horrific crash that focused national attention on unintended acceleration:
http://www.injuryboard.com/national-news/crash-that-led-to-toyota-recall-inconclusive.aspx?googleid=275542